Swimming pool



FIG. 1 is a top view of the swimming pool;

FIG. 2 is a longitudinal section of the same;

FIG. 3 is a cross-section through line 3--3 of FIG. 2;

FIG. 4 is a cross-section through line 4--4 of FIG. 2. 

The ornamental design for a swimming pool, as shown and described. 